Which of the folloiwng is inappropriately defined ?
I. Host is an organism which provides only food, sheltere to another organism
II. Amensalism is a relationship in which one species is benefitted, whereas the other is unaffected
III. predator is an organism that catches and kills other organism for food of same species
IV. parasite is an organism which always lives inside the body of other organism and may kill it
Select the correct option

Options

A. I and II
B. III and IV
C. I,II,III and IV
D. I,III and IV

Answer

To determine which of the given statements is inappropriately defined, we can analyze each statement one by one.

### Step 1: Analyze Statement I
**Statement I:** "Host is an organism which provides only food, shelter to another organism."

- A host is indeed an organism that provides resources to another organism, typically a parasite. However, the definition is incomplete because it suggests that the host only provides food and shelter. In reality, the host is crucial for the parasite's survival, growth, and reproduction, and the relationship can be more complex than just providing food and shelter. Thus, this statement is inappropriately defined.

### Step 2: Analyze Statement II
**Statement II:** "Amensalism is a relationship in which one species is benefitted, whereas the other is unaffected."

- Amensalism is actually a relationship where one species is harmed while the other is unaffected. This statement incorrectly defines amensalism, making it inappropriately defined.

### Step 3: Analyze Statement III
**Statement III:** "Predator is an organism that catches and kills other organisms for food of the same species."

- This statement is incorrect because a predator typically catches and kills prey from different species, not the same species. Predation involves one species benefiting (the predator) and the other being harmed (the prey). Therefore, this statement is also inappropriately defined.

### Step 4: Analyze Statement IV
**Statement IV:** "Parasite is an organism which always lives inside the body of another organism and may kill it."

- This statement is misleading because while many parasites do live inside their hosts, there are also ectoparasites that live on the surface of the host. Additionally, not all parasites kill their hosts; many live in a symbiotic relationship where the host survives. Therefore, this statement is also inappropriately defined.

### Conclusion
All four statements (I, II, III, and IV) are inappropriately defined.

### Final Answer
The correct option is that all statements are inappropriately defined.

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